Ferromagnetic Phone Case Shielding for Magnetic Flux Interference
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Solution Overview
Problem
Mobile electronic devices enclosed in cases experience interference from electromagnetic flux generated by magnetic auxiliary devices, which can affect device operations such as stylus pen precision due to magnetic coupling and wireless charging functionality.
Innovation Solution
Incorporating a ferromagnetic plate, specifically a steel plate cold commercial (SPCC), into the case design to shield the mobile electronic device from magnetic flux, ensuring it does not block magnetic waves necessary for wireless charging and maintaining magnetic coupling with auxiliary devices while attenuating unwanted magnetic fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a ferromagnetic plate is added to the case for electromagnetic shielding, then the device is protected from magnetic flux interference, but the device complexity increases
Solution Approach 1:
A ferromagnetic plate is introduced as an intermediary element between the magnetic auxiliary device and the mobile electronic device. This plate acts as a mediator that redirects magnetic flux lines around the wireless charging coil, preventing direct magnetic coupling that would interfere with charging operations while still allowing the magnetic case to hold the device securely.
Solution Approach 2:
The case is divided into distinct functional zones: a ferromagnetic shielding plate layer and a magnetic auxiliary device layer. The shielding plate is positioned at a specific distance from the mobile device surface, creating segmented magnetic field zones that separate the harmful direct coupling from the useful magnetic holding function.
2Object-affected harmful factors
If the ferromagnetic plate is positioned close to the coil for effective shielding, then magnetic flux interference is reduced, but wireless charging efficiency decreases due to blocked magnetic waves
Solution Approach 1:
The ferromagnetic plate is positioned selectively rather than covering the entire device surface. It is placed in specific locations where magnetic flux redirection is most effective, such as around the edges or specific zones of the wireless charging coil area, allowing magnetic waves to pass through unobstructed paths while still providing shielding where needed.
Solution Approach 2:
Instead of placing the ferromagnetic plate directly on the device surface (two-dimensional contact), it is positioned at a controlled distance above the device, creating a three-dimensional spatial arrangement. This vertical separation allows magnetic flux to be redirected in the air gap without physically blocking the magnetic waves needed for wireless charging.
3Force
If magnetic coupling with auxiliary devices is strengthened, then magnetic holding force increases, but electromagnetic interference with device operations increases
Solution Approach 1:
The ferromagnetic plate serves as a mediator that decouples the magnetic holding function from the wireless charging function. It provides a path for magnetic flux that enables strong magnetic coupling for holding while simultaneously protecting the wireless charging coil from direct magnetic interference, thus maintaining both strong holding force and operational reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The ferromagnetic plate effectively reduces the impact of magnetic flux on the mobile device's operations, preventing distortion and ensuring reliable functionality, including wireless charging and stylus pen accuracy, by curtail magnetic lines of force without obstructing necessary magnetic fields.
Implementation Method 1
a ferromagnetic plate, particularly steel plate cold commercial, for shielding a mobile electronic device enclosed in the case from an effect of electromagnetic flux
Implementation Method 2
the mobile electronic device has a coil for wireless charging
Implementation Method 3
a magnetic auxiliary device of the mobile electronic device having a magnet is attached to the case
Data Source
AI summary
Devices and products for shielding a mobile electronic device enclosed in a case from an effect of electromagnetic flux generated when a magnetic auxiliary device for the mobile electronic device having a magnet is attached to the case are described. According to one embodiment, the case comprises a protective cover configured to at least partially cover the mobile electronic device and a ferromagnetic plate made of SPCC disposed on the protective cover. In one example embodiment, the at least one ferromagnetic plate is to magnetically couple with the magnet of the magnetic auxiliary device attached to a contact surface of the case, and the at least one ferromagnetic plate is to shield the mobile electronic device from the magnetic flux generated.